your team is shooting poorly because of low per ratings without exceptional spd/bh. giving your team the once over, it is clear you have a major weakness, which is 3 point shooting.
should you have shot as poorly against that crappy team? probably not. 4-16 is not unreasonable though for a poor 3 point shooting team. its really easy to make or miss a couple extra threes (and significantly easier to miss a couple extra) compared to your average, so on 16 attempts, that is really not surprising at all. expected? no, but very reasonable.
its tough to do anything at this point. really, the time to solve this problem is 3 and 4 season ago when you were recruiting your upperclassmen guards. a critical element of competing at a high level is planning your teams out well in advance, making sure you put together a group of players that will cover all the bases, and will work together in an effective and efficient manner. its tough, but makes all the difference in the world...